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Preliminary User’s Manual U13420EJ2V0UM00
CHAPTER 9 WATCHDOG TIMER
9.1 Watchdog Timer Functions
The watchdog timer has the following functions.
• Watchdog timer
• Interval timer
• Oscillation stabilization time selection
Caution
Select the watchdog timer mode or the interval timer mode with the watchdog timer mode
register (WDTM). (The watchdog timer and the interval timer cannot be used simultaneously.)
Figure 9-1 shows a block diagram of the watchdog timer.
Figure 9-1. Watchdog Timer Block Diagram
f
X
/2
8
RUN
Clock
input
circuit
control
INTWDT
RESET
WDT mode signal
3
OSTS2 OSTS1 OSTS0
WDCS2 WDCS1 WDCS0
RUN WDTM4
Internal bus
Division
circuit
Divided
clock
selection
circuit
Output
controller
Devision mode
selection circuit
WDTM3
Oscillation stabilization
time select register
(OSTS)
Watchdog timer
clock select
register (WDCS)
Watchdog timer
mode register
(WDTM)
Содержание mPD780065 Series
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